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FL6300A — Quasi-Resonant Current Mode PWM Controller for Lighting
November 2012
FL6300A
Quasi-Resonant Current Mode PWM Controller for Lighting
Features
High-Voltage Startup
Quasi-Resonant Operation
Cycle-by-Cycle Current Limiting
Peak-Current-Mode Control
Leading-Edge Blanking (LEB)
Internal Minimum t
OFF
Internal 5 ms Soft-Start
Over-Power Compensation
GATE Output Maximum Voltage
Auto-Recovery Over-Current Protection (FB Pin)
Auto-Recovery Open-Loop Protection (FB Pin)
Latch Protection V
DD
Pin and Output Voltage (DET
Pin) OVP
Description
The FL6300A lighting power controller includes a highly
integrated PWM controller and provides several features
to enhance the performance of flyback converters in
medium- to high-power lumens applications.
The FL6300A is applied on quasi-resonant flyback
converters, where maximum operating frequency is
limited to below 100 kHz. A built-in HV startup circuit
can provide more startup current to reduce the startup
time of the controller. Once the V
DD
voltage exceeds the
turn-on threshold voltage, the HV startup function is
disabled to reduce power consumption. An internal
valley voltage detector ensures that the power system
operates at quasi-resonant operation over a wide-range
of line voltage and load conditions, as well as reducing
switching loss to minimize switching voltage on the drain
of the power MOSFET.
To minimize standby power consumption and improve
light-load efficiency, a proprietary Green-Mode function
provides off-time modulation to decrease switching
frequency and perform extended valley voltage
switching to keep to a minimum switching pulse. The
operating frequency is limited by minimum t
OFF
time,
which is 38 µs to 8 µs.
FL6300A also provides many protection functions.
Pulse-by-pulse current limiting ensures the fixed-peak
current-limit level, even when a short circuit occurs.
Once an open-circuit failure occurs in the feedback loop,
the internal protection circuit disables PWM output
immediately. When V
DD
drops below the turn-off
threshold voltage, the controller disables PWM output.
The gate output is clamped at 18 V to protect the power
MOSFET from high gate-source voltage conditions. The
minimum t
OFF
time limit prevents the system frequency
from being too high. When over-voltage protection
(OVP) is triggered by DET or when internal over-
temperature protection (OTP) is triggered, the power
system enters Latch Mode until AC power is removed.
Frequency Operation Below 100 kHz
Applications
General LED Lighting
Industrial, Commercial, and Residential Fixtures
Outdoor Lighting: Street, Roadway, Parking,
Construction, and Ornamental LED Lighting Fixtures
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